William stewart



W. STEWART.

ELECTRIC PLUG AND SOCKEI CONNECIION. APPLICATION FILED AUG-21.1w].

1,308,609 L Rimmed May13, 1919 WILLIAM STEWART, OF WEST KOGARAH, NEWSOUTH WALES, AUSTRALIA.

ELEGTRlZC PLUG SOCKET GQNNECTION,

Specification of Letters Patent 1 1 Patented May 13, 1919.

Application filed August 21-, 1917. Serial no.:ia7,4co.

To all whom it may concern:- 7

Be it known that I, WILLIAM STEWART, a subject of the King of GreatBritain, residing at Glenrock, Warrialda street, West Kogarah, in theState of New South Wales and Commonwealth of Australia, electrician,have invented a new and useful Improvement in and relating to ElectricPlug and Socket Connections, of which 'theiollowing is a specification.I

This invention relates to the plug and socket connections or unions ofelectrical circuits as for electric bulbs or lamps, domestic irons,toasters and other devices and has been specially devised in order toprovide cheap, handy and efiective means whereby theconnecting plug asof a bulb or lamp when inserted in the socket cannot be with drawn againuntil the lamp is broken or the lock on said plug destroyed and thusprevent the connection being broken, disjointed, or parted and the lampor other'device being removed or stolen and thus further prevent thesocket being used for other or illegitimate purposes as by occupiers ofrooms or apartments connecting radiators or other current consumingdevices to electric light circuits. 1 7

According to this invention a collar or locking band adapted torevolubly fit on the ordinary connecting sockets has intruding slotsfrom one end and outer wall a spring with inwardly bent end or ends orpin or pins adaptedto intrude beyond the inner periphery of said wallwhen no resistance is ofieredas when said spring armed locking bandpositioned over t e socket with its intrudingslots coinciding with thebayonet slots of said socket is slightly revolved from said coincidentpositionto the holding position of said socket after the retainingpintles of the plug are inserted through said coincident slots.

outer loose thimble or shield is posit'oned over the locking bandbefore. mentioned. when said band is over the socket so as to inclosethe spring. ,Tliis shield abuts against the holding nut of the socket oragalnst a washer held thereby and reaches to the shoulder of the plug orof its aflixed' lamp or fittin shoul er, or the shield-may have anintegral flange or be contracted at either end to abut end fittings orcontours. into practical the socket or plug In carrymg this inventionsuflicient length carries'on or in its or to a washer in turn abuttingsaid provided therefor).

efiect the various parts mayv have many modifications within the scopeand for the purposes above set out but in order that the carrying out ofsaid invention may be easily put into practice the now best known mannerof doing. so will be described with reference to the drawingsaccompanying and forming part of this complete specification.

Figure 1 is a perspective" view of aplug and socket union and lock withits parts disassembled. Fig. 2 is a similar view showing some partsassembled ready to complete the union and lock. Fig. 3 isanother-similar view showing all the parts assembled and the union andlock completed." Fig. 4:

is an elevation partly in section of the completed union and look as inFig; 3. a Fig. 5 is a sectional plan on plane 5-5,,Fig. 2. Fig. 6 is asectional plan on line 6-6, Fig. (1. Fig. .7 is anenlarged sectionalperspective view of a locking band on a socket wall. F1gs. 8 and 9 aresectional elevations illustrating modified constructions .of lockshields- The collar or locking band, 12 vwith slots 13 carries spring14; with inturned ends 15 passing through orifices 16." The shield 21adapted to-take over the locking band is of to comfortably fit betweenan abutment on the socket and one on the base or plug of a lamp or otherlike fitting.

To insert the plug end 17 of a lamp 18 or other appliance in the socketa union or connection and lock it therein the locking band 12 with itsspring 14- is placed over the socket 19 its slots 13 being positionedcoincident with the slots 20. of said socket and the inturned ends ofthe spring 15 comfortably loosely fitting the orifices 16. A thimble orshield 21 is placed over the end 19 of plug 17 both as shown in Fig. 2and the in the coincident slots 13 and 20 as the lampor other device ispushed piwardly as far as it will 'go and then partially revolved tomove the pintles 22 into the angular extension of the slots 20 andwhich" movement carries the locliing [band around on the socket 19 untilthe spring ends 15-pass into said slots 20 or the extensions thereof (orinto the supplementary orifices or pin holes The plug 17 is thuspreventedfrom being further revolved in either direction to disengageits pintles 22 from extensions of slots 20 and enable said socket19'tobereleased and consequently the parts are firmly locked together, theouter shield 21 preventing manlpulation of the [spring 14 in endeavorsto free the parts.

. the locking band 12 thus removing the ends When it is desired toremove a spent or broken lamp the shoulder 23 or band'of the lamp as thecase may be is pressed together to allow withdrawal of the shield '21when the spring 14 may be pulled or released from 15 from the slots andthe plug 17 may then be removed from the socket 19 as ordinarily.

VVhen a lamp or other plug'end has a shoulder, which willnot-supportashield of sufficient diameter a contracted thimbleirestingon the band'of the lamp as shown in Fig. 8' may beus'ed and when thelockmg nut'24 on the socket or other projecting part upon said socket isnot large enough for a shield otthe' required diameter to' butt againsta washer 25 preferably 'coned and placed concavely or convexly towardthe shield may be secured on the socket say between its'locking nut andits body before the shield '21 is positioned thereover as shown in Fig.9;

If necessary'to-support the shield when the socket is pendant or thelamp has been broken or removed a spring holder is placed around thesocket or the plug with its projecting ends adapted to thrust againstthe interiorface of the shield;

In a -modified construction of this invention in place of a completeband carrying the locklngspring ends orpins are pieces circumferentiallyslidably attached to the sockets" are substituted and each carries aspring end-and has a'slot corresponding to the slot in socket and areoperated and have the same efi'ectas the band.

, What.I claim as m invention, and desire.

tosecure by Letters U atent is 1.; Ina device forilocking electrical lugand socket unions a-.collar or'- locking and having slots thereinrevolubly fitting the ,socket and carr ing a spring with end or 4 endsor pin or pins adapted to engage in the I wall ofsaid socket asand forthe. purposes set forth. substantially as herein, described andexplained. 1

2. In'a device for locking electrical pluand socket unions asemi-circular shape spring adapted to fit upon a locking band and'havinginturned ends adapted to pass through orifices in the wall of saidlocking band as andfor the purposes set forth substantially as hereindescribed and explained.

T 3. An improved" locking electrical plug and socket union comprising asocket with slots therein, a locking band over said socket and havingslots therein in juxtaposition with the slots in said socket andcarrying a spring with intruding end or ends to engage the slots in saidsocket and an outer thimble or shield to fit over the socket and plugand be retained in position thereon between said socket and a shoulderon said plug by the consummation of the union as and for the purposesset forth substantially as herein described and explained.

4. In an electrical plug and socket connection, means for positivelylocking the parts. together comprising a band provided with holes,spring-pressed pins extending through said holes and engaging orificesin I the wall of the socket.

5.In an electrical plug and socket con nection, means for positivelylocking the plug in the socket, comprising a band provided with a hole,a spring-pressed pin extending through said hole and engaging an orificein the Wall 015 thesocket.

6. In an electrical plug and socket connection, means for positivelylocking the plug .in the socket, comprising a band having holes therein,spring-pressed pins extending through said holes and engaging slots inthe socket and pins on said plug engaging slots in said socket and band.

7. In an electrical plllug and socket connection, means for loc 'ng theplug in the socket comprising a slotted socket, a band provided withholes, a semi-circular spring embracing said band, said spring havinginturried ends fittin in said holes and engaging the slots insaidsocket.

8. In an electrical plug and socket connection, means for locking theparts together

